Atomic nitrogen as a probe of physical conditions in the interstellar medium

Details Atomic nitrogen as a probe of physical conditions in the interstellar medium Atomic nitrogen as a probe of physical conditions in the interstellar medium

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..102d&link_type=abstract

Astrophysical Journal, vol. 207, July 1, 1976, pt. 1, p. 102-109. Research supported by the Science Research Council

Astronomy and Astrophysics

Astrophysics

31

Astrophysics, Interstellar Gas, Nitrogen Atoms, Planetary Nebulae, Spectrum Analysis, Transition Probabilities, Atomic Collisions, Electron Scattering, Emission Spectra, Forbidden Transitions

Scientific paper

Accurate computations of the collision strengths of atomic nitrogen are used to calculate emissivities for transitions from the 4S ground state to the individual levels of the 2D and 2P doublets. The density-sensitive ratio between the intensities of the N I forbidden lines at 5198 and 5200 A is analyzed in an attempt to obtain information about conditions in transition regions of ionization fronts around planetary nebulae and Herbig-Haro objects. Mechanisms for the partial ionization of material lying beyond an ionization front are considered.

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